package com.xinnet.mms.web;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.RequestMapping;
/**
 * 
 * 
 * @author 王湛智[wangzhanzhi@xinnet.com]
 *
 * @version 1.0
 *
 * @since 2014年2月20日
 *
 */
@Controller
@RequestMapping("/image")
public class ImageController {
	/**
	 * 
	 * 功能描述：生成验证码
	 *
	 * @param request
	 * @param response
	 * @return
	 *
	 * @author 王湛智[wangzhanzhi@xinnet.com]
	 *
	 * @since 2014年2月20日
	 *
	 * @update:[变更日期YYYY-MM-DD][更改人姓名][变更描述]
	 */
	@Transactional(propagation=Propagation.REQUIRED,readOnly=true)
	@RequestMapping("/rand")
	public String getImg(HttpServletRequest request,HttpServletResponse response) {
		
		response.setHeader("Pragma","No-cache");
		response.setHeader("Cache-Control","no-cache");
		response.setDateHeader("Expires", 0);
		
		// 在内存中创建图象
		int width=60, height=20;
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

		// 获取图形上下文
		Graphics g = image.getGraphics();

		//生成随机类
		Random random = new Random();

		// 设定背景色
		g.setColor(getRandColor(200,250));
		g.fillRect(0, 0, width, height);

		//设定字体
		g.setFont(new Font("Times New Roman",Font.PLAIN,18));

		//画边框
		g.setColor(new Color(222,222,32));
		g.drawRect(0,0,width-1,height-1);


		// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
		g.setColor(getRandColor(160,200));
		for (int i=0;i<155;i++)
		{
			int x = random.nextInt(width);
			int y = random.nextInt(height);
		        int xl = random.nextInt(12);
		        int yl = random.nextInt(12);
			g.drawLine(x,y,x+xl,y+yl);
		}

		char [] c = {'A','B','C','D','E','F','G','H','I','J','K','L','M',
                'N','O','P','Q','R','S','T','U','V','W','X','Y','Z',
                'a','b','c','d','e','f','g','h','i','j','k','l','m',
                'n','o','p','q','r','s','t','u','v','w','x','y','z',
                '0','1','2','3','4','5','6','7','8','9'};
		
		// 取随机产生的认证码(4位数字)
		String sRand="";
		for (int i=0;i<4;i++){
		    //String rand=String.valueOf(random.nextInt(10));
		    int test = random.nextInt(62);
        	String rand = String.valueOf(c[test]);
		    sRand+=rand;
		    // 将认证码显示到图象中
		    g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));//调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
		    g.drawString(rand,13*i+6,16);
		}

		// 将认证码存入SESSION
		request.getSession().setAttribute("rand",sRand);


		// 图象生效
		g.dispose();

		// 输出图象到页面
		try {
			ImageIO.write(image, "JPEG", response.getOutputStream());
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		return null;//返回null


	}
	
	private Color getRandColor(int fc,int bc){//给定范围获得随机颜色
        Random random = new Random();
        if(fc>255) fc=255;
        if(bc>255) bc=255;
        int r=fc+random.nextInt(bc-fc);
        int g=fc+random.nextInt(bc-fc);
        int b=fc+random.nextInt(bc-fc);
        return new Color(r,g,b);
    }
}
